当将控制转移到合适的段时，处理器清除IF标志，因此关闭将来的可屏蔽中断。
While transferring control to the proper segment, the processor clears the IF flag, thus disabling further maskable interrupts.
干扰后系统复位时，应将重要系统信息从备份中恢复，并将已激活的中断标志清除。
After the system restoration from disturbance, the important system information should be resumed from the backup and the interrupting sign cleaned out.
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